yeaaah, that's absolutely fantastic! I **love** it. But - the sad news - you are wrong. The traditional toasters feature a relatively large spring (coil type), which catapults the toaster upwards. And if this spring is too strong the result(s) will be as you've illustrated it. However, I didn't intend to develop a toast gun barrel ;-}, so I used a lift system together with a helix or coil type spring.
The bi-metal will - if heated up according to the presets - release the lever for the spring. Now the spring can pull as much as it wants - it can **not** jump up because it has to go through sort of a retarder or clutch. A principle like this one (and as I have investigated it in extremely expensive toasters): place your hand on your deskt and move it forward without pressure = pull down stage. Now apply pressure to your hand (=heated bi-metal with a slightly large size) and pull it back = lift up stage. Bi-metals are wonderful gadgets in mechanical constructions.
There is only one drawback: **if** someone should lubricate the brackets of the bi-metal, the US Army will give me a call to deliver 2.000 of them to bomb Iraq ;-}.
BTW, in most old cars there is a bi-metal to watch the cooler temperature. As soon as the cooler temperature rises above a certain point, the bi-metal will release and open a contact to stop the ignition.
See why I love good ol' mechanics? No electronical gadget is as reliable as a mechanical masterpiece. But the world tends to forget 'ancient' or 'pre historic' inventions in favour of kinky electronics.
The trick in product development is to have a weird brain - otherwise you end up copying existing solutions --sigh--. As long as the price dictates a solution, this is ok. But if the price is of less importance, you can use more parts and new solutions.
Have a great day!
jens
jens g.r. benthien
designer
http://www.sacalobra.de
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If you don't know how to dream you'll never be a designer.
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We can't solve problems by using the same kind of thinking we used when we created them.
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